A direct esterification of α-alkoxy alkanes with acids is reported under transition-metal-free conditions mediated by NCS with a broad substrate generality.
Bu4NI-catalyzed decarboxylative acyloxylation of an sp3 C–H bond adjacent to a heteroatom with α-oxocarboxylic acids
作者:Shuai Zhang、Li-Na Guo、Hua Wang、Xin-Hua Duan
DOI:10.1039/c3ob40748a
日期:——
A novel metal-free decarboxylative acyloxylation of an sp3 CâH bond in formamides and ethers has been explored. A variety of N-acyloxymethylamides and α-acyloxy ethers could be easily synthesized by this method. Preliminary mechanistic studies have shown that the reaction proceeded via a radical process.
A practical and efficient construction of C–O bonds via oxidative cross-coupling reaction of aldehydes and ethers has been realized under open air. When 2 mol% copper was used as the catalyst, various α-acyloxy ethers were obtained with up to 93% isolated yield.
Bu4NI-Catalyzed CO Bond Formation by Using a Cross-Dehydrogenative Coupling (CDC) Reaction
作者:Long Chen、Erbo Shi、Zhaojun Liu、Shulin Chen、Wei Wei、Hong Li、Kai Xu、Xiaobing Wan
DOI:10.1002/chem.201100192
日期:2011.4.4
crème de la crème! A practical and simple Bu4NI‐catalyzed CO bondformation was achieved by using a cross‐dehydrogenative coupling (CDC) reaction with tert‐butyl hydroperoxide (TBHP) as the ultimate oxidant (see scheme; R1=aryl, heteroaryl, alkyl; R2, R3=alkyl, alkyl halide). This approach is the most straightforward method to date for the synthesis of α‐acyloxy ethers. A plausible mechanism has been proposed
奶油!通过使用叔丁基过氧化氢(TBHP)作为最终氧化剂的交叉脱氢偶联(CDC)反应,实现了实用且简单的Bu 4 NI催化的CO键形成(参见方案; R 1 =芳基,杂芳基,烷基; R 2,R 3=烷基,烷基卤)。该方法是迄今为止合成α-酰氧基醚的最直接方法。已经提出了一种合理的机制。
Bu4NI-catalyzed α-acyloxylation reaction of ethers and ketones with aldehydes and tert-butyl hydroperoxide
作者:Feng Zhu、Zhong-Xia Wang
DOI:10.1016/j.tet.2014.11.002
日期:2014.12
The reaction of (hetero)aromatic aldehydes or cinnamaldehyde with di-/multi-ethers in the presence of Bu4NI and tert-butylhydroperoxide generated corresponding α-acyloxy ethers. Reactions between (hetero)aromatic aldehydes or cyclohexanecarbaldehyde with arylalkyl ketones under similar conditions resulted in α-acyloxy ketones. Collectively, Bu4NI-catalyzed α-acyloxylation reactions exhibit a broad